I know what you mean, Bruce also has a distinct voice, you know it's him when you hear him sing. He's one of the few people to actually have that, someone you'll know and remember right off the bat.
Metallica's business point of view is lame, I agree with you there. However yes their music is not bad, my favorite is probably "Creeping Death", however you probably would not like that :lol:
Hmmm, Megadeth, I would advise you to listen to "Trust" by them. I can give you a link if you want.